package jdbc;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class teachershowcourse
 */
@WebServlet("/src/teachershowcourse")
public class teachershowcourse extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public teachershowcourse() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setHeader("Access-Control-Allow-Origin", "*");//模板
	    response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");//模板
	    response.setHeader("Access-Control-Allow-Headers", "Content-Type");//模板
	    //设置编码格式
	    request.setCharacterEncoding("UTF-8");//模板
	    response.setCharacterEncoding("UTF-8");//模板
		
	    String current_page = request.getParameter("current_page1");
	    String recordsperpage = request.getParameter("recordsperpage1");
	    String teacher_id = request.getParameter("teacher_id");
	    //int id = Integer.parseInt(student_id);
	    int currentPage = Integer.parseInt(current_page);
	    int recordsPerpage = Integer.parseInt(recordsperpage);
	    hello a = new hello();//模板
	    try {//模板
			ResultSet b;
			
				b = a.doselect("SELECT course_name, course_classroom, course_time, course_id "
						+ "from course c "
						+ "INNER JOIN teacher t ON c.course_teacher = t.teacher_id "
						+ "where t.teacher_id=?",teacher_id);
			    int rowCount = 0;
			    if (b.last()) {
			        rowCount = b.getRow();
			        b.beforeFirst(); // 将指针移回起始位置
			        response.getWriter().write(String.valueOf(rowCount)+";");
			    }
				b = a.doselect("SELECT course_name, course_classroom, course_time, course_id "
						+ "from course c "
						+ "INNER JOIN teacher t ON c.course_teacher = t.teacher_id "
						+ "where t.teacher_id=?"
						+ "LIMIT ?, ?",teacher_id,  (currentPage-1)*recordsPerpage, recordsPerpage);
			
			
			while(b.next()) {//b代表查询结果，查询之后的那个表，next（）函数就是往下一行，逐行扫描
				response.getWriter().write(b.getString("course_name")+";");//这里表示的是往返回的那个response里面添加字符串，修改write括号后的内容即可
				response.getWriter().write(b.getString("course_classroom")+";");
				response.getWriter().write(b.getString("course_time")+";");
				response.getWriter().write(b.getString("course_id")+";");				
				//response.getWriter().write(b.getString("selected")+";");
			}//模板
			b.close();
		
		} catch (SQLException e) {//模板
			e.printStackTrace();//模板
		}//模板
	}

}
